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C
REATING
C
USTOM
C
OMPONENTS
IN
L
ATTICE
M
ICO
S
YSTEM
:
Specifying WISHBONE Interface Connections
LatticeMico32 Hardware Developer User Guide
59
Table 3 lists the signals required to connect the master port to the
LatticeMico32 platform. Table 4 lists the signals required to connect the slave
port to the LatticeMico32 microprocessor. The ports that make up the
WISHBONE master or slave port must follow the specifications described in
the
LatticeMico32 Processor Reference Manual
table entitled “List of
Component Port and Signal Name Suffixes.”
Save
Saves all the data currently entered for the component being defined. The Save
button performs a DRC to determine if the component is syntactically correct and
saves the data.
If the DRC fails, a message is displayed indicating that the component has errors
and cannot be used in a platform. The component icon displays a small red “x” in
the bottom left-hand corner.
If you are going to overwrite an existing component, another message appears
that asks permission to overwrite the previous design files.
Cancel
Cancels the actions and closes the dialog box. If you did not save your changes,
a message box comes up to warn you that the changed data will be lost.
Reset
Resets all values in all tabs in the dialog box.
Help
Displays the help for the dialog box.
Table 2: Master/Slave Port Tab Options (Continued)
Option
Description
Table 3: LatticeMico32 Master Component WISHBONE Ports
Component Port Names for
WISHBONE Slave Port
Direction
Width
Required
<Prefix
>_ADR_O
Output
32
Yes
<Prefix
>_DAT_O
Output
32
No
<
Prefix
>_WE_O
Output
1
Yes
<
Prefix
>_SEL_O
Output
4
Yes
<
Prefix
>_STB_O
Output
1
Yes
<
Prefix
>_CYC_O
Output
1
Yes
<
Prefix
>_LOCK_0
Output
1
No
<
Prefix
>_CTI_O
Output
3
No
<
Prefix
>_BTE_O
Output
2
No
<
Prefix
>_DAT_I
Input
32
No
<
Prefix
>_ACK_I
Input
1
Yes
<
Prefix
>_ERR_I
Input
1
No
<
Prefix
>_RTY_I
Input
1
No